Package org.apache.calcite.test

Class MockSqlOperatorTable.TopNTableFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.test.MockSqlOperatorTable.TopNTableFunction

All Implemented Interfaces:

SqlTableFunction

Enclosing class:

MockSqlOperatorTable

public static class MockSqlOperatorTable.TopNTableFunction
extends SqlFunction
implements SqlTableFunction

"TopN" user-defined table function. First parameter is input table with set semantics.

Field Summary

Fields inherited from class org.apache.calcite.sql.SqlOperator

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor	Description
TopNTableFunction()

Method Summary

Modifier and Type	Method	Description
boolean	argumentMustBeScalar(int ordinal)	Returns whether the ordinalth argument to this operator must be scalar (as opposed to a query).
SqlReturnTypeInference	getRowTypeInference()	Returns the record type of the table yielded by this function when applied to given arguments.
TableCharacteristic	tableCharacteristic(int ordinal)	Returns the table parameter characteristics for ordinalth parameter to this table function.

Methods inherited from class org.apache.calcite.sql.SqlFunction

deriveType, getFunctionType, getNameAsId, getParamNames, getParamTypes, getSqlIdentifier, getSyntax, isQuantifierAllowed, unparse, validateCall, validateQuantifier

Methods inherited from class org.apache.calcite.sql.SqlOperator

acceptCall, acceptCall, adjustType, allowsFraming, checkOperandCount, checkOperandTypes, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, createCall, createCall, createCall, deriveOperandType, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, getSqlCallFactory, getStrongPolicyInference, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, leftPrec, not, preValidateCall, requiresDecimalExpansion, requiresOrder, requiresOver, reverse, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

TopNTableFunction

public TopNTableFunction()

Method Details

getRowTypeInference

public SqlReturnTypeInference getRowTypeInference()

Description copied from interface: SqlTableFunction

Returns the record type of the table yielded by this function when applied to given arguments. Only literal arguments are passed, non-literal are replaced with default values (null, 0, false, etc).

Specified by:

getRowTypeInference in interface SqlTableFunction

Returns:

strategy to infer the row type of a call to this function

tableCharacteristic

public TableCharacteristic tableCharacteristic(int ordinal)

Description copied from interface: SqlTableFunction

Returns the table parameter characteristics for ordinalth parameter to this table function.

Returns null if the ordinalth argument is not table parameter or the ordinal is smaller than 0 or the ordinal is greater than or equals to the number of parameters.

Specified by:

tableCharacteristic in interface SqlTableFunction

argumentMustBeScalar

public boolean argumentMustBeScalar(int ordinal)

Description copied from class: SqlOperator

Returns whether the ordinalth argument to this operator must be scalar (as opposed to a query).

If true (the default), the validator will attempt to convert the argument into a scalar sub-query, which must have one column and return at most one row.

Operators such as SELECT and EXISTS override this method.

Overrides:

argumentMustBeScalar in class SqlOperator